package thread.demo.concurrentMap;

import java.util.HashMap;
import java.util.Hashtable;
import java.util.concurrent.ConcurrentHashMap;

public class ConcurrentMapTest001 {
  public static void main(String[] args) {
    HashMap<String, String> map1 = new HashMap<>();
    map1.put("1", "1");
    
    Hashtable<String, String> map2 = new Hashtable<>();
    map2.put("1", "1");
    
    ConcurrentHashMap<String, String> map3 = new ConcurrentHashMap<>();
  }
}
